linux-kernel - Re: [PATCH v2 08/14] objtool: Add elf_create

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Date:   Fri, 19 Mar 2021 16:24:40 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     x86@...nel.org, jgross@...e.com, mbenes@...e.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/14] objtool: Add elf_create_reloc() helper

On Fri, Mar 19, 2021 at 10:12:59AM -0500, Josh Poimboeuf wrote:

> > -void elf_add_reloc(struct elf *elf, struct reloc *reloc)
> > +int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
> > +		  unsigned int type, struct symbol *sym, int addend)
> >  {
> > -	struct section *sec = reloc->sec;
> > +	struct reloc *reloc;
> > +
> > +	reloc = malloc(sizeof(*reloc));
> > +	if (!reloc) {
> > +		perror("malloc");
> > +		return -1;
> > +	}
> > +	memset(reloc, 0, sizeof(*reloc));
> > +
> > +	reloc->sec = sec->reloc;
> 
> Maybe elf_add_reloc() could create the reloc section if it doesn't
> already exist, that would help remove the multiple calls to
> elf_create_reloc_section().

I'll do that as yet another patch ;-)

> > +	reloc->offset = offset;
> > +	reloc->type = type;
> > +	reloc->sym = sym;
> > +	reloc->addend = addend;
> >  
> >  	list_add_tail(&reloc->list, &sec->reloc_list);
> 
> This should be sec->reloc->reloc_list?

Absolutely, there were a few other 'funnies' as well that I just fixed
whilst trying to make the whole new stack work again :-)